Air-heater.



W. N. LE PAGE.

Patented May 24, 1910.

,4? akbomaugn UNITED STATES PATENT OFFICE.

WILLIAM 1\T. LE PAGE, OF VANCOUVER/ BRITISH COLUMBIA, CANADA, ASSIGNOR'IO ETHEL MAY LE PAGE, OF VANCOUVER, CANADA.

AIR-HEATER.

Specification of Letters Patent.

Patented May 24, 1910.

' Application filed October 9, 1909. Serial No. 521,944.

To all whom it may concern:

Be it known that I, WILLIAM N. LE PAGE. a citizen of the Dominion ofCanada, residing at Vancouver, in the Province of British Columbia,Canada, have invented a new and useful Air-Heater, of which thefollowing is a specification.

This invention relates to an air heater for domestic buildings andbelongs to that class wherein a supply of pure external air is passedthrough a chamber in contact with water pipes heated by gas burners orother means and my object has been to obtain a greater heat than isobtainable where the air is brought in contact with hot water orsaturated steam. This object I attain by the provision of asupplementary gas burner or other heater by which the steam generated inthe water coils may be superheated adjacent to the final hot airdelivery. The particular means by which this object is carried out isparticularly described in the following specification, reference beingmade to the drawings by which it is accompanied, in which:

Figure 1 is a vertical part section through the heater on the line A Ain Fig. 2; Fig. 2, a plan showing in dotted lines the arrangement of thesupplementary heater coils; and Fig. 3, a sectional plan on the line B Bin Fig. 1.

These drawings show the application of the device to an air heatingfurnace of a common type and to the use of Bunsen gas burners but itmust be distinctly understood that the particular form and arrangementof the casing which incloses the heating coils and the use of gasburners is not material to the invention as the casing may be modifiedand other heating agencies employed.

As here shown the invention comprises a water coil 2 heated by a Bunsengas burner 3 of approved design and this coil and its burner is inclosedin a chamber a to which access may be had by means of a doorway 5, butto or from which it is not necessary that there should be any vent orflue other than the doorway 5 as such door may be left open when theburner 3 is lighted to give exit to the products of combustion.

The heating chamber 4 has a dead plate 6 occupying the position of thefurnace grate of an ordinary heater and is surrounded by an annularfresh air flue 7 to which pure air is admitted from an external sourcethrough a passage 8. As in an ordinary air heating furnace the heatingchamber is surrounded by an annular flue 9 through which the products ofcombustion pass the same may be utilized as a means for exposing bothsides of the pure air passage 7 to the heat from the burnerv 3 and thewater coils 2. The fresh air flue or passage 7 may be of segmental arcform in cross section, as clearly shown in Fig. 3. The whole is inclosedby an external casing 10 of heat nonconducting material.

The water heating coil 2 is provided with a closable feed pipe 11 bywhich the coil may be filled with water to the required height asindicated by an external gage glass 12.

The annual fresh air passage 7 is in connection above with asupplementary heating chamber 15 which is inclosed within the externalcasing 10, and within this supplementary chamber 15 is a coil 16connected by pipes 17 and 18 to the water coil 2 in the chamber atbeneath. This coil 16 being designed to superheat the steam from thecoil 2 is independently heated by a separate Bunsen gas burner 20 orother means and is provided with a safety valve and pressure gage. Fromthe chamber 15 the pure heated air passes through the outlet passages 22and is conveyed by pipes to the several rooms of a house or parts of abuilding. The upper gas burner may be automatically regulated by athermostat or other means.

In use the water coil 2 is filled with water to the required height asindicated on the gage glass 12 and the filling aperture is closed. Theheat is then applied to the Water coil by the gas burner 3 or otherheating agency and when steam is generated it passes up into the coil 16and is there superheated by the gas burner 20 or other heating agency.The pure air entering at the inlet 8 is heated by contact with the wallsof the passage 7 and passing upward enters the supplementary heatingchamber 15 to receive a further increase of heat from contact withthepipes of the coil 16 which contain steam from the coils 2 beneathsuperheated by the Bunsen burner 20.

A means is thus provided whereby pure air is heated above thetemperature of boiling water or saturated steam While advantages arisefrom the convenience of water and steam coils as a means for oifering anextended heating surface to the incoming air.

Having now particularly described my invention and the manner of itsuse, I hereby declare that what I claim as new and desire to beprotected in by Letters Patent, is:

1. In an air heater, an outer casing, partitions in said casing dividingthe same into three horizontal chambers, one above the other, a primarywater containing coil in the intermediate chamber, a heater for saidcoil within said intermediate chamber, a secondary heating coil in theupper chamber, pipe connections between the secondary heating coil andthe primary heating coil, a secondary burner in the upper chamber forsaid secondary heating coil, means for admitting fresh air into thelower chamber, means for exhausting heated air from the upper chamher,and a pipe of segmental arc form in said second chamber surrounding saidprimary heating coil and connecting the lower and upper chambers topermit passage of air from the lower to the upper chamber.

2. In a hot air furnace, a casing having a plurality of horizontalpartitions dividing the same into an upper, an intermediate and a lowerchamber, a door opening into said intermediate chamber, a primaryheating coil in said intermediate chamber, a secondary heating coil inthe upper chamber, pipe connections between said heating coils, meansfor applying heat to said primary heating coil, and independent meansfor applying heat to said secondary heating coil, and means within saidintermediate chamber for efiecting communication between said upper andlower chambers, means for admitting fresh air into said lower chamber,means for conveying air out of said upper chamber, all being arrangedthat said secondary heating coil and said upper chamber will also beheated from the heat in said intermediate chamber, substantially asshown and described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

WILLIAM N. LE PAGE.

Witnesses ROWLAND BRITTAIN, ALEXANDER SMITH.

